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arXiv 2406.04792astro-ph.GA
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超新星内爆驱动的恒星形成

Star Formation by Supernova Implosion

Leonard Elias Cornelius Romano, Andreas Burkert, Manuel Behrendt

AI总结:

本文通过构建简单模型研究超新星遗迹内爆触发恒星形成的效率,发现循环模式下效率较低,单次爆发模式下效率较高,并指出该过程可解释富金属恒星的形成。

摘要:

近期对超新星遗迹(SNR)演化晚期的流体动力学模拟揭示,当超新星遗迹与周围介质并合时会发生内爆,从而在其中心形成致密云团。这些云团虽然受到其宿主超新星遗迹的高度化学增丰,却表现出与巨分子云相似的性质,而巨分子云被认为是恒星形成的主要场所。在此,我们构建了一个简单模型,以估计超新星遗迹内爆可能触发的恒星形成效率。我们分别考虑了两种情况:循环恒星形成,由新一代恒星反馈的间歇性驱动维持;以及单次爆发恒星形成,由单次爆炸触发。我们发现,在循环情况下,恒星形成效率较低,内爆触发的恒星形成对每个自由落体时标内观测到的恒星形成效率的贡献仅为百分之几。在单次爆发情况下,可以获得更高的恒星形成效率。然而,尽管内爆触发的过程对整体恒星形成的贡献可能不大,但由于诞生云团的高度化学增丰,它可以解释相当一部分富金属恒星的形成。

英文摘要:

Recent hydrodynamical simulations of the late stages of supernova remnant (SNR) evolution have revealed that as they merge with the ambient medium, SNRs implode, leading to the formation of dense clouds in their center. While being highly chemically enriched by their host SNR, these clouds appear to have similar properties as giant molecular clouds, which are believed to be the main site of star formation. Here, we develop a simple model, in order to estimate the efficiency of the star formation that might be triggered by the implosion of SNRs. We separately consider two cases, cyclic star formation, maintained by the episodic driving of feedback from new generations of stars; and a single burst of star formation, triggered by a single explosion. We find that in the cyclic case, star formation is inefficient, with implosion-triggered star-formation contributing a few percent of the observed star-formation efficiency per free-fall timescale. In the single-burst case, higher star-formation efficiencies can be obtained. However, while the implosion-triggered process might not contribute much to the overall star-formation, due to the high chemical enrichment of the birth clouds, it can explain the formation of a significant fraction of metal-rich stars.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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